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University of Western Australia (2016)

Water relations during drought and the recovery from drought in two Eucalyptus species with contrasting water-use strategies

Jakob, Sonja

Titre : Water relations during drought and the recovery from drought in two Eucalyptus species with contrasting water-use strategies

Auteur : Jakob, Sonja

Université de soutenance : University of Western Australia

Grade : Doctor of Philosophy (PhD) 2016

Présentation
In recent decades, climate change has led to drought and heat-induced mortality events in forest ecosystems worldwide. Our current understanding of physiological mechanisms leading to drought-induced tree death is limited, which prevents us from accurately predicting responses of forest to a warmer and drier climate in the future. Since carbon and water relations are inevitably linked through stomatal control, it has been suggested that trees can die from hydraulic failure or carbon starvation. This PhD project aimed at exploring the effects of drought on carbon and water relations in seedlings of two Eucalyptus species. The two species, Eucalyptus marginata Sm. and Eucalyptus wandoo Blakely, were chosen because they are known to exhibit contrasting water use strategies. Eucalyptus marginata is a relatively isohydric species and has been shown to reduce its water loss in response to dry conditions to maintain higher leaf water potentials. Eucalyptus wandoo, on the other hand, develops distinctly low water potentials before substantially reducing its stomatal conductance and it is thus considered a relatively anisohydric species. Consequently, the two species were expected to show distinct responses to drought, which could affect carbon relations.

Résumé de la thèse

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Page publiée le 4 septembre 2016, mise à jour le 20 novembre 2016